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The extinct vizcacha Lagostomus incisus is a particular rodent recorded in Pliocene sediments of Buenos Aires Province (Argentina), including the montehermosan “Irenean” Fauna and Monte Hermoso Formation, and the chapadmalalan Chapadmalal Formation. Its characteristic skull and cheek teeth anatomy permit to easily identify it even with fragmentary material. In this work, the fossil record of L. incisus is reassessed, being recognized in several units where it had not been reported before:...
Topics: Cenozoic, Pliocene, Biostratigraphy, Argentina, Uruguay, Chinchillidae
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The early Miocene marine deposits in Tierra del Fuego bear a group of struthiolariid gastropods that stand out for their high morphological variability. since the end of the 19th century this variability was interpreted as reflecting (1) a highly diversified rapidly evolving group of species or (2) a single, plastic species characterized by ample intraspecific variability. The morphological study of more than 100 specimens of the Fuegian struthiolariid genus Perissodonta Martens collected in...
Topics: Struthiolariid, Perissodonta ameghinoi, Intraspecific variability, Miocene, Tierra del Fuego,...
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The San Salvador Formation is one of the few deposits from the Pliocene–Lower Pleistocene in the east of Entre R.os Province, which from a palaeontological point of view has been described exclusively through its phytolith content. This contribution includes the synthesis and expansion of this knowledge through the results of the phytolith study of the Jos. Etchepare Hijo profile (Col.n Department, Entre R.os). For this, an ad-hoc methodology has been used, adapted to obtain phytoliths in...
Topics: Phytoliths, San Salvador Formation, Uruguay river valley, Plio–Lower Pleistocene
The continental early–middle Miocene Santa Cruz Formation (SCF) from Patagonia is one of the most important stratigraphic units of southern South America in terms of the terrestrial Neogene record. Its fossil content was pivotal for establishing the succession of Cenozoic faunas from Patagonia and formed the basis of the Santacrucian South American Land Mammal Age. Despite the updated knowledge recently achieved, the stratigraphic distribution of many taxa within the SCF remains to be...
Topics: Typotheria, Caviomorpha, Burdigalian–Langhian, Santacrucian, Patagonia
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n this work we focus on the fossil record of turtles and tortoises from the Chubut Province, in Patagonia, Argentina. This record is the richest, most diverse, the longest and continuous in the country and one of the most important in the continent. In this work, we present and study new fossils from all known clades of turtles from the province, coming from targeted field campaigns, as well as from past investigations, placed in a comprehensive and detailed chronostratigraphic context. In...
Topics: Meiolaniformes, Testudines, Pleurodira, Cryptodira, Chelidae, Testudinidae, Dermochelyidae
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La conservación preventiva de los bienes patrimoniales estuvo inicialmente asociada a las variables ambientales de los museos que los custodiaban. Las colecciones paleontológicas, si bien menos susceptibles que otras colecciones biológicas, no son ajenas a esta problemática; sin embargo, la comunidad científica ha sido muchas veces reticente a esta realidad. A partir de la década de 1970, diversas instituciones del Reino Unido, Estados Unidos de América, Canadá y algunos países...
Topics: Riesgo ambiental, Conservación preventiva, Paleontología, Argentina
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Foraminifera and calcareous nannofossils from washed drill-cuttings of three wells in the Chilean sector of the Magallanes Basin were studied. This contribution aims to identify, characterize and illustrate microfossil assemblages throughout the Cenozoic sedimentary record to integrate foraminiferal and nannofossil data, and improve further biostratigraphic studies in the basin. The analyzed Paleogene and Neogene successions in these three wells correspond to five discrete foraminiferal and...
Topics: Foraminifera, Nannofossils, Paleogene, Austral Basin, Taxonomy
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May 13, 2021 Alberto Boscaini, Marina Peralta Gavensky, Gerardo De Iuliis, & Sergio Fabián Vizcaíno
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Florentino Ameghino was among the most prolific and influential paleontologists of South America. He left a vast body of scientific work, of considerable relevance even today, but also many open questions related to his enigmatic life and personality. One of these obscure aspects has surely been the absence of reliable geographical and chronological information on his birth. For more than a century, the main hypothesis was that Ameghino was born in the city of Luj.n (Province of Buenos Aires,...
Topics: Ameghino, Argentina, Burmeister, Capellini, Italy, Luján, Moneglia, Moreno
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May 5, 2021 Lucas Nicolás Lerzo, José Luis Carballido, & Pablo Ariel Gallina
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An isolated vertebra from the Late Cretaceous of Uzbekistan (Asia), previously interpreted as a titanosaur anterior caudal, was recently assigned as the holotype and unique specimen of a new rebbachisaurid taxon, Dzharatitanis kingi. This record would drastically impact both biogeographical and chronological aspects of the group. As some of the characters identified for such systematic assignment seem to have been incorrectly scored and/or have a more widespread distribution amongst...
Topics: Dzharatitanis, Titanosauria, Cretaceous, Rebbachisauridae, Dinosauria
The amendment of the genus Margocolporites and three new fossil species with their extant relatives from the late Miocene Palo Pintado Formation, in the province of Salta, Argentina, are proposed. They are Parihiatus aquaticus sp. nov. (Pontederia spp., Pontederiaceae), Margocolporites gleditsioides sp. nov. (Gleditsia amorphoides, Fabaceae) and Margocolporites constrictus sp. nov. (Parkinsonia aculeata, Fabaceae). From the analysis of the fossil record in the Cretaceous–Pleistocene period,...
Topics: Fossil pollen, Pontederia, Gleditsia, Parkinsonia, Miocene, Argentina
Los plesiosaurios son reptiles reconocidos como un clado derivado de eosauropterigios, cuyo biocrón se extiende desde el Triásico Tardío hasta el Cretácico Tardío. su registro fósil los ubica en sedimentos marinos de todos los continentes incluyendo la Antártida. En este grupo, el grado de compactación y la organización del tejido óseo han sido utilizados para determinar estadios ontogenéticos relati- vos según los cuales un patrón típicamente denso...
Topics: Histología ósea, Foramen nutricio, Cuerpo vertebral, Plesiosaurio
During the late Campanian and early Maastrichtian, Northern Patagonia suffered the first stage of the Atlantic marine ingression that reached the Neuquén Basin. The Allen and La Colonia formations show the early stages of this change, and were deposited in a complex asso- ciation of marginal marine environments, including coastal and marine deposits (i.e., flood plains, estuaries and lagoons). The plesiosaurs from the Allen and La Colonia formations included at least three species, each with...
Topic: Elasmosauridae. Polycotylidae. Late Cretaceous. Patagonia. Sulcusuchus erraini
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Notosuchia is a diverse clade of Crocodyliformes that achieved a remarkable diversity during the Cretaceous. This group is particu- larly abundant in continental deposits of Gondwana throughout the Cretaceous, especially in South America. Notosuchia was first recognized as a distinct group by the early work of Gasparini in the 1970’s and in the last decades numerous discoveries and studies have increased the geographical, temporal and taxonomical scope of this clade. Here we analyze the...
Topics: Notosuchia, Diversity, Radiation, Cretaceous, Gondwana
Metriorhynchidae was the only Crocodylomorpha with a pelagic marine lifestyle. Related to this lifestyle, its peculiar body plan al- lows clearly differentiate them from others Crocodylomorpha. The fossil record of metriorhynchids from Tithonian–Berriasian levels of the Vaca Muerta Formation (Neuquén Basin, Argentina) is outstanding, in terms of quantitative and qualitative record. Its taxonomical diversity is composed by four taxa: Cricosaurus araucanensis, Cricosaurus lithographicus,...
Topics: Cricosaurus, Dakosaurus, Purranisaurus, Tithonian, Berriasian, Vaca Muerta Formation,...
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Dec 4, 2020 Paula Bona, Francisco Barrios
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The fossil record of Alligatoroidea in Argentina is mainly represented by Caimaninae alligatorids. This lineage recorded two impor- tant moments in its natural history, one at the beginning of the Paleogene (Late Paleocene–Middle Eocene) and the other in the Neogene (Late Miocene). The most ancient record of alligatoroids in South America comes from the Early Paleocene of Patagonia. It includes basal forms of caimanines such as Necrosuchus ionensis, Eocaiman palaeocenicus, Eocaiman...
Topics: Crocodylia, Alligatoroids, Cenozoic, South America, Argentina
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La neuroanatomía de los dinosaurios en general es poco conocida. El neurocráneo es una estructura compleja cuyo estudio se ha incrementado en los últimos años debido, en parte, al uso de tomografías computadas. Más aún, estudios recientes han indicado la relevancia filogenética que presentan los caracteres neurocraneanos. El propósito del presente estudio es la caracterización de la morfología general del neurocráneo de dinosaurios Saurischia, con énfasis en las formas...
Topics: Neuroanatomía, Neurocráneo, Endocráneo, Theropoda, Sauropoda
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Dec 4, 2020 Xabier Pereda-Suberbiola, Ignacio Díaz-Martínez, Leonardo Salgado, Silvina De Valais
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Thyreophora es un clado de dinosaurios ornitisquios que reúne a estegosaurios, anquilosaurios y formas basales como Scelidosaurus. Su registro fósil se extiende desde el Jurásico Inferior hasta el Cretácico Superior. Muchos de los fósiles de tireóforos descubiertos hasta la fecha provienen de yacimientos situados en el hemisferio norte. No obstante, el registro gondwánico comprende relevantes restos esqueléti- cos y/o icnitas en Sudamérica, África, Madagascar, Australia,...
Topics: Thyreophora, Stegosauria, Ankylosauria, Jurásico–Cretácico, Gondwana
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Dec 4, 2020 Alejandro Otero, Leonardo Salgado
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Sauropodomorpha comprende a los dinosaurios herbívoros más abundantes y diversos, con un registro global. En la Argentina su registro es particularmente rico y abundante y sus taxones han dado luz a los hitos más importantes de la historia evolutiva de este grupo de dinosaurios saurisquios. El origen de Sauropodomorpha, la transición hacia Sauropoda, así como la diversificación de Diplodocoidea y Macronaria son, en gran medida, ejemplificados por el registro proveniente de las capas...
Topics: Sauropodomorpha basales, Sauropoda, Diplodocoidea, Macronaria, Argentina, Registro fósil
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Dec 4, 2020 Nathalie Bardet, Alain Galoyer
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The Late Campanian white Chalk of Meudon, a city located in the suburbs of Paris (France), has yielded during the 19th century several mosasaurid remains consisting mainly in isolated teeth, most being nowadays lost. These specimens, which history is associated to the most famous French palaeontologists of that time like Georges Cuvier, Paul Gervais and Albert Gaudry, represent the earliest mosasaurid discoveries from France. As such, they are precious and unique witnesses of a lost world. In...
Topics: Mosasaurids, Campanian, Chalk, Meudon, France
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Dec 4, 2020 María Eurídice Páramo Fonseca
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En este artículo se pretende mostrar el estado actual del conocimiento de los reptiles marinos cretácicos de Colombia. Se ofrece una breve síntesis histórica de los estudios realizados, se brinda un panorama de los taxones presentes y se discuten algunos aspectos de su distribución geográfica y estratigráfica. La revisión realizada revela que en los sedimentos marinos cretácicos de Colombia los restos de reptiles marinos son abundantes e incluyen fósiles de tortugas, plesiosaurios,...
Topics: Reptiles marinos, Cretácico, Colombia, Suramérica
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Dec 4, 2020 Adriana M. Albino, Santiago Brizuela
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Los escamosos conforman un exitoso grupo de reptiles que incluye más de 9.600 especies actuales. Su evolución en América del Sur, escasamente ilustrada por un registro fósil incompleto y episódico, es consecuencia de la compleja historia geológica y paleoclimática de esta parte del mundo. El registro del Mesozoico está concentrado principalmente en Argentina y Brasil, con menor presencia en Bolivia. Los principales clados de reptiles escamosos (Iguania y Scleroglossa) aparecen en el...
Topics: Lagartos, Anfisbenios, Serpientes, Mesozoico, Cenozoico, América del Sur
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Dec 4, 2020 Marta S. Fernández, Lisandro Campos
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Thunnosaurian ichthyosaurs represent the paradigm of reptilian body designed for a pelagic life style. Most derived thunnosaurian, the ophthalmosaurids, have been traditionally considered as members of a declining lineage. New findings and the re-examination of historical collections radically changed our conceptions about them. Opthalmosaurids were ecologically more diverse than previously thought. The past few decades have seen an increase of nominal species spurred by new findings and...
Topics: Ophthalmosaurids, Nominal species, Species delimitations
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Dec 4, 2020 Marcelo S. de la Fuente, Juliana Sterli
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El estudio de las tortugas extintas en el territorio argentino se inició hace 157 años cuando el naturalista francés Auguste Bravard nominó la primera especie de tortuga. Desde ese entonces hasta la actualidad se incrementó el conocimiento de los Testudinata del territorio argentino en una progresión geométrica, desde las meras nominaciones de especies sin ningún tipo de caracterización, realizadas por los naturalistas y los pioneros de los estudios paleontológicos del siglo XIX,...
Topics: Testudinata, Triásico, Jurásico, Cretácico, Paleógeno, Neógeno, Cuaternario, Argentina
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Dec 4, 2020 Alejandro F. Zucol, Noelia I. Patterer, Heraldo A. Leiva, Mariana Brea, Esteban Passeggi
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En esta contribución se da a conocer la asociación fitolítica de una secuencia sedimentaria perteneciente a la Formación Arroyo Feliciano (Pleistoceno Superior), ubicada en la localidad Paso Duarte (provincia de Entre Ríos), alta cuenca del río Gualeguay. El escaso contenido paleontológico hallado hasta la actualidad describe una fauna que se correlacionaría con el Piso/Edad Bonaerense−Lujanense de la provincia de Buenos Aires. Los antecedentes paleobotánicos provienen de los...
Topic: Cuaternario. Cuenca del río Gualeguay. Paleoclima. Paleoambiente. Silicofitolitos
Se analizaron los atributos tafonómicos de una muestra de microvertebrados constituida por 67805 restos esqueléticos del sitio arqueológico Cueva Tixi (Tandilia oriental, provincia de Buenos Aires, Argentina). Se registraron restos asignados a mamíferos, aves, anuros, ofidios y peces, todos con alteraciones, en una secuencia de 11000 años (Pleistoceno Tardío–Holoceno tardío). La mayor proporción de la muestra compuesta por roedores, marsupiales didélfidos, aves, anuros y algunos...
Topics: Alteraciones óseas, Egagrópilas, Preservación esquelética
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Dec 4, 2020 Silvina Susana Garralla, Luisa Matilde Anzótegui, Lilia René Mautino
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Los objetivos de este trabajo son relacionar las paleofloras del Mioceno–Plioceno del norte de la Argentina que caracterizan a cada formación y a cada período, comparar las registradas en el noroeste con las del nordeste a fin de establecer sus diferencias o semejanzas e inferir la evolución florística y paleoambiental a través del intervalo estratigráfico considerado. Las formaciones seleccionadas son las de Paraná e Ituzaingó en el nordeste y las de Anta, San José, Chiquimil, Palo...
Topics: Paleovegetación, Paleoambiente, Neógeno, Norte de Argentina
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Dec 4, 2020 Cecilia M. Deschamps, Rodrigo L. Tomassini
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The knowledge of the vertebrate systematics and bio-chronostratigraphy of late Cenozoic from the southwest of the Buenos Aires Province is updated. The study is focused on 12 localities that encompass the latest Miocene to the Holocene. Biochronologic units were identified and correlated to those of other areas of the Pampean Region. Farola Monte Hermoso, Bajo San José and Playa del Barco outstand because they yielded a large amount of fossil remains. In turn, the quarries near Grünbein...
Topics: Biostratigraphy, Mammals, Late Miocene–Holocene, Buenos Aires Province, Argentina
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This work is an updated review of the knowledge on the evolution and development of palaeoenvironments during the Holocene marine ingression and posterior regressive event in Tierra del Fuego. During the beginning of the marine transgression, ca. 8000 cal yr BP, the vegetation in the southern coastal areas along the Beagle Channel was mainly arboreal with dominance of Nothofagus forest and scarcity of shrub and herbaceous communities, while in the northeastern Atlantic coast, the treeless...
Topics: Palaeoenvironments, Marine sequences, Late Quaternary, Tierra del Fuego
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Dec 4, 2020 Ana M. Borromei, Lorena L. Musotto, Andrea Coronato, Juan F. Ponce, Xabier Pontevedra-Pombal
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he pollen analysis from Cañadón del Toro peat bog (54° 49’ 36” S; 68° 27’ 36” W), located in an interior valley of the Fuegian Andes, provides information about vegetation and climate changes during the last 13,500 years. The results indicate the postglacial development of steppe-like vegetation under drier and colder conditions than today, followed by the expansion of Nothofagus into the valley after 10,350 cal. yr BP. At this time, the predominance of a forest-steppe ecotone...
Topics: Vegetation and climate history, Lateglacial-Holocene, Interior valleys, Tierra del Fuego
En este trabajo se sintetizan y discuten los resultados de ca. 30 años de estudios palinológicos de depósitos aluviales del Pleistoceno Tardío-Holoceno de la región pampeana (RP). La mayor parte de las reconstrucciones de la vegetación para ese lapso han derivado del análisis polínico de depósitos aluviales, aunque en ciertos casos los resultados son controvertidos. La presente revisión muestra que el análisis palinológico de sucesiones aluviales es un recurso importante de...
Topics: Palinología fluvial, Tafonomía, Preservación polínica, Argentina
Two fossil sections (Late Quaternary), and a group of modern samples analyzed through pollen and non-pollen palynomorphs, enabled the reconstruction of the palaeoclimatic and palaeoenvironmental conditions of the lower basin of the Quequén Salado River (Buenos Aires Province). The study was complemented with analysis of sedimentology, malacofauna, ostracods, diatoms, and mammal and archaeological remains. For the Late Pleistocene, the scarce presence of microfossils, associated with eolian...
Topics: Palaeoenvironmental-palaeoclimatic changes, Late Quaternary, Quequén Salado River, Argentina
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The Mesozoic Era is crucial for analyzing the replacement of microplanktonic lineages resulting from the beginning of the break-up of Pangea. The paleogeography of South America, and hence of Argentina, underwent successive changes since this time. The opening of different seaways, mainly during the Jurassic, affected the global circulation pattern of the oceans which determined the composition of the organic-walled marine microplankton associations of the Neuquén Basin. These Jurassic marine...
Topics: urassic, Marine palynofloras, Paleobiogeography, Neuquén Basin, Argentina
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Dec 4, 2020 M. Veronica Guler, Melisa A. Paolillo, Paula A. Martz
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The present work documents and gathers the most relevant records of the organic-walled dinoflagellate cysts from different sites of the Neuquén and Austral Basins. Most of these records have contributed to the palaeoenvironmental, biostratigraphical and palaeobiogeographical interpretations of the different stratigraphical units in both basins. The dinoflagellate cysts assemblages come from the Springhill, Upper Rio Mayer, Piedra Clavada, Kachaike and Margas Verdes Formation of the Austral...
Topics: Cretaceous, Marine palynomorphs, Sedimentary basins, Argentina
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Dec 4, 2020 C. Marcela Borel, M. Verónica Guler, Edgardo Navarro, Ricardo Astini
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n this contribution we describe planktonic assemblages, comprising their taxonomic composition and palaeoecological attributes, from the La Colonia Formation, Patagonia, Argentina. The palynological samples are from the section exposed at Estancia San Miguel, in the Telsen area, Chubut province. Diverse organic-walled remains of Chlorophyta and Charophyta taxa are documented. These include coenobia of two species of Pseudopediastrum, colonies of Botryococcus and zygospores of the form-genus...
Topics: Organic-walled algae, Palaeoecology, Fresh/brackish water, Maastrichtian–?Paleocene, Patagonia
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Se analiza el panorama paleontológico en Argentina y el rol que tuvieron las políticas estatales y privadas en los ámbitos donde se desarrollaba la investigación paleontológica en relación con las políticas sociales entre 1908 y 1912. Este período se extiende desde la propuesta de construcción hasta la inauguración oficial del Asilo Saturnino E. Unzué en Mar del Plata. Se utilizan como ejemplo y se comparan dos instituciones estatales, el Museo Nacional de Buenos Aires y la Sociedad...
Topics: Paleontología, Museo Nacional de Buenos Aires, Sociedad de Beneficencia de la Capital, Asilo...
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Dec 3, 2020 Sergio F. Vizcaíno, Gerardo De Iuliis, Paul D. Brinkman, Richard F. Kay, Daniel L. Brinkman
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An album of photographs in the Kansas University Natural History Museum found together with the Patagonian fossils collected by Handel T. Martin in 1904 was assumed in a recent publication to have been assembled by Martin. It comprises 193 numbered pages and 580 photographs of prepared fossil vertebrate specimens, some labeled as from the Museo de La Plata and others, without labels, which were assumed as having been in F. Ameghino’s private fossil collection. However, archival evidence in...
Topics: Handel T. Martin, William B. Scott, Florentino Ameghino, Fossil mammals, Santa Cruz Formation,...
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Dec 3, 2020 Cecilia M. Deschamps, Germán M. Gasparini, Elisa Beilinson, Marcelo A. Zárate, Rodrigo L. Tomassini
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The stratigraphic reinterpretation of a controversial paleontological site such as the Quequén Salado River banks allowed refinement of the biochron of the caenolestine marsupial Pliolestes tripotamicus Reig. Two fossil bearing units were proposed for these exposures: a lower one, AUA (Huayquerian) and an upper one, AUB (Montehermosan). P. tripotamicus is found in AUA, but not in AUB or in typical Montehermosan and Chapadmalalan localities, which suggests that this taxon was not part of the...
Topics: Huayquerian, Montehermosan, Chapadmalalan, Quequén Salado River, Buenos Aires Province, Pliolestes
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Los palmares de Butia yatay (Mart.) Becc. en el Parque Nacional El Palmar (Colón, Entre Ríos), son comunidades relictuales que se desarrollan sobre los suelos arenosos que pertenecen al orden de los Entisoles. Estos suelos constituyen las terrazas antiguas del río Uruguay. La serie de suelos Puerto Yeruá son suelos arenosos pardos formados sobre terrazas y poseen un mayor desarrollo pedológico. Se ha estudiado la composición fitolítica de la secuencia pedológica de esta serie de suelos...
Topics: Silicofitolitos, Serie Puerto Yeruá, Parque Nacional El Palmar, Río Uruguay, Paleoambientes
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South American native ungulates include several extinct lineages that evolved within the context of South American Cenozoic geographic isolation. By the late early Miocene Santacrucian Age, the orders Notoungulata, Litopterna, and Astrapotheria were differentiated. Recent ecomorphological studies highlighted complex functional patterns between their habitat/diet and hypsodonty. In order to understand these relationships in an evolutionary context we used geometric morphometrics methods (27 3-D...
Topics: Notoungulata, Litopterna, Santacrucian, Geometric Morphometrics, D’Arcy Thompson, Modularity
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Dec 3, 2020 José L. Carballido, Femke M. Holwerda, Diego Pol, Oliver W. M. Rauhut
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 Eusauropods were a group of herbivorous dinosaurs that evolved during the Early Jurassic and dominated the terrestrial ecosystems throughout the Jurassic and Cretaceous. A peak of diversity is represented by the Late Jurassic, when most of the lineages of the derived clade, Neosauropoda, are represented. Different lineages of eusauropods differ in several morphological aspects, including a great diversity in gathering strategies, inferred by their dentition morphology and wear facets. Here we...
Topics: Sauropoda, Wear facets, Narrow-crowned, Broad-crowned
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Numerosos trabajos regionales o locales han propuesto el reconocimiento de unidades biogeográficas de distintos rangos (biocoremas) basadas sobre la distribución de los moluscos bivalvos para el Jurásico, pero no existía una síntesis a nivel mundial. Este trabajo es una revisión de las más significativas de esas propuestas, en un intento de lograr una síntesis de los patrones biogeográficos globales desde el Jurásico Temprano al Tardío, mientras se producían cambios sustanciales en...
Topics: Paleobiogeografía, Jurásico, Bivalvia, Biocoremas, Provincias biogeográficas, Bipolaridad,...
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En 1895, H. Eberhard descubrió un fragmento de cuero de mamífero, con pelos y osteodermos, en una caverna cercana a Puerto Consuelo (Seno de Última Esperanza, Chile). Los restos fueron asignados a un perezoso milodóntido, nominado en 1899 Neomylodon listai por F. Ameghino. El hallazgo suscitaría numerosas publicaciones y una fuerte competencia, especialmente entre F.P. Moreno y F. Ameghino. Posteriormente al hallazgo de Eberhard, nuevos restos de tegumento fueron colectados por otros...
Topics: Neomylodon listai, Grypotherium, Cueva del Milodón, Ameghino, Moreno, Osteodermos, Cuero
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Dec 3, 2020 Santiago Fernández, Juan Ochando, Manuel Munuera, Gabriela Amorós, José Carrión
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Este artículo pretende una revisión crítica de los datos palinológicos del Cuaternario ibérico con particular atención al Pleistoceno Tardío y Holoceno. Se analizan aspectos relacionados con la ciclicidad climático astronómica y su influencia sobre la cubierta vegetal, los reservorios de fitodiversidad durante los estadiales, la colonización tardiglacial y holocena y el posible efecto de la acción antrópica sobre la dinámica forestal a partir del Holoceno Medio. Se comparan las...
Topics: Palinología, Paleoecología, Pleistoceno, Holoceno, España, Portugal, Quercus, Pinus
Los campos constituyen una de las regiones de los pastizales del Río de la Plata que se extiende en Uruguay y en la porción meridional de Rio Grande do Sul (Brasil), cuya potencialidad para realizar estudios palinológicos aún está escasamente explorada. En este trabajo se revisa y analiza el estado actual de las investigaciones palinológicas actuales y fósiles en la región de los campos. Se discuten los modelos de la relación polen-vegetación actual como análogo moderno y se...
Topics: Análisis polínico, Pastizales del Río de la Plata, Bosques, Pleistoceno, Holoceno
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Dec 3, 2020 Lorena Laura Musotto, María Soledad Candel, Ana María Borromei, Juan Federico Ponce, María Virginia Bianchinotti
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En esta contribución se exponen los materiales estudiados, las metodologías de muestreo y las técnicas de laboratorio utilizadas para el análisis palinológico de turberas y depósitos marinos del Archipiélago de Tierra del Fuego. Asimismo, se evalúan las limitaciones y fortalezas del análisis de indicadores biológicos (polen, esporas, microplancton de pared orgánica y hongos). Finalmente, se presentan tres casos de estudio donde se ilustra: i) el análisis de microfósiles...
Topics: Polen, Microfósiles fúngicos, Palinomorfos acuáticos, Paleoambientes, Argentina
Las reconstrucciones del pasado se tornan más objetivas si se considera el mayor número de indicadores posible. En especial, las reconstrucciones ambientales de los últimos 20.000 años son importantes para el entendimiento de la dinámica de los sistemas naturales. Los macrofósiles vegetales tienen características que complementan el análisis polínico, permitiendo una mejor reconstrucción de la vegetación cuando se estudian en conjunto. El registro de macrofósiles acredita la...
Topics: Polen, Macrorrestos vegetales, Mallín, Lago Argentino, Cuaternario tardío
La ecología de incendios es una actividad interdisciplinaria concerniente al estudio de los procesos naturales que involucran fuego en los ecosistemas y su interacción con los componentes bióticos y abióticos. Numerosos estudios orientados al conocimiento de la evolución de los ecosistemas naturales y humanos bajo la influencia recurrente del fuego atraviesan el trabajo interdisciplinario en el marco de la Ecología y de las Ciencias de la Tierra. El efecto de los incendios naturales y...
Topics: Paleoecología, Palinología, Métodos de reconstrucción de la historia de incendios, Ecología...
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Dec 3, 2020 María Virginia Mancini, Florencia P. Bamonte, María Alejandra Marcos, Gonzalo D. Sottile, Marcos E. Echeverría
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En este trabajo se discuten los diferentes aspectos metodológicos a tener en cuenta en los estudios paleoecológicos. Las consideraciones teóricas y metodológicas discutidas incluyen los siguientes aspectos: tipos de depósitos, procesos tafonómicos, representación polínica actual a partir de muestras de sedimento y registro de la vegetación, suma polínica representativa de la composición de la comunidad vegetal, productividad polínica diferencial y dispersión de taxones y su...
Topics: Análisis polínico, Aspectos metodológicos, Tipos de depósitos, Tafonomía, Relación...
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Dec 3, 2020 Aldo R. Prieto, María Virginia Mancini, María Eugenia De Porras, Florencia Paula Bamonte, María Alejandra Marcos
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La palinología de sitios arqueológicos o arqueopalinología ha sido frecuentemente utilizada en la Argentina tanto para reconstruir la vegetación y los ambientes desde el final del Pleistoceno Tardío hasta tiempos recientes, como para inferir ciertas actividades culturales desarrolladas dentro de los sitios arqueológicos. En el presente trabajo se realizó una revisión de los análisis polínicos realizados a partir de depósitos sedimentarios en sitios arqueológicos en cuevas, aleros...
Topics: Palinología, Arqueología, Tafonomía polínica
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Dec 3, 2020 Liliana Lupo, Gonzalo Torres, Pamela Fierro, Brenda Oxman, Ana Carina Sánchez, Elizabeth Pereira, Karsten Schittek
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Para comprender el origen causal de las variaciones del paisaje y particularmente de las comunidades vegetales en los diferentes escenarios ambientales con larga historia de ocupación humana, como los ecosistemas de montaña del noroeste argentino, es importante integrar metodologías que permitan ajustar la interpretación de los diferentes contextos ambientales durante el Cuaternario tardío. En este marco, es fundamental el conocimiento espacio-temporal de las asociaciones...
Topics: Paleopalinología, Paleoambientes, Sistemas agropastoriles, Arqueopalinología, Andes Centrales,...
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La Diagonal Árida Sudamericana (DAS) es un rasgo biogeográfico y climático que ha experimentado cambios importantes en los ambientes, en las plantas, en los animales e incluso en las poblaciones humanas como consecuencia de la dinámica climática durante el Cuaternario tardío. El objetivo de este trabajo es revisar el desarrollo de las investigaciones en palinología del Cuaternario tardío a lo largo de la DAS, analizar sus desafíos, destacar las metodologías aplicadas para obtener...
Topics: Polen, Ambientes depositacionales, Pleistoceno, Holoceno, Zonas áridas y semiáridas, América del...
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Este trabajo reseña la historia del desarrollo de la palinología del Cuaternario en la Argentina durante los últimos 90 años. Se focaliza en el desempeño y las publicaciones de los investigadores en dicha disciplina en el contexto del desarrollo de las políticas institucionales y su relación con los procesos económicos y políticos, más que en el aporte que estas contribuciones han hecho a la comprensión de la historia de la vegetación, el clima y los ecosistemas. Se han...
Topics: Análisis palinológico, Holoceno, Pleistoceno
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LIBRO DE RESÚMENES DE LAS 31 JORNADAS ARGENTINAS DE PALEONTOLOGÍA DE VERTEBRADOS
Topic: Vertebrate Paleontology
LIBRO DE RESÚMENES DE LA Reunión de Comunicaciones de la Asociación Paleontológica Argentina 2017
Topic: Paleontology
LIBRO DE RESÚMENES de la Reunión de Comunicaciones de la Asociación Paleontológica Argentina, 2018 Auspician
Topic: Paleontology
LIBRO DE RESÚMENES, XXXII JORNADAS ARGENTINAS DE PALEONTOLOGÍA DE VERTEBRADOS y VII JORNADAS TÉCNICAS DE PALEONTOLOGÍA DE VERTEBRADOS
Topic: Vertebrate Paleontology
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In this paper, the current state of knowledge of the taphonomic characteristics of micromammal (rodents and marsupials) remains generated by the action of the different predators (avian raptors and carnivore mammals) of South America (particularly of Argentina), known through actualistic studies, is reviewed. The analyzed taphonomic attributes enabled the adjustment, by means of extensive comparisons among different groups of predators and prey, of the modification categories indicated in...
Topics: Bone modifications, Neotaphonomy, Micromammals, Predators, Actualistic analogous, Argentina
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Dec 3, 2020 Luisa Anzótegui, Silvina Garalla, Lilia Mautino, Darien Prado
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The aims of this paper are to analyze the woody fossil (arboreal and shrubby) flora of the center-north of Argentina and to relate it to the flora of the current Seasonally Dry Neotropical Forests (SDNF), Chaco and Cerrado, in order to establish its permanence and extension over time. The fossil species (pollen, impressions of leaves and fruits, woods and cuticles) coming from of Paraná, Ituzaingó, Anta, San José, Chiquimil, Palo Pintado, Andalhuala, del Buey, Toro Negro, Sálicas, Arroyo...
Topics: Neogene, Seasonally dry neotropical forests, Chaco, Cerrado, Argentina
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Dec 3, 2020 Santiago Reuil, Paula Muzzopappa
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The technique presented in this paper points to the recovery of three dimensional rigid casts from natural molds of fossil organisms. The study of organisms preserved as molds in the rock (usually in slabs) is difficult, even if the natural mold is high detailed. Traditionally, casts were made from each side of the natural mold, resulting in positive, soft partial specimens embedded in the rock. These kinds of casts did not solve some issues related to the preservational mode and exposure of...
Topics: Silicone rubber, Resin, Replicas, Molding technique, Slabs, Museum
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LIBRO DE RESÚMENES DE LAS 33as JORNADAS ARGENTINAS DE PALEONTOLOGÍA DE VERTEBRADOS
Topic: Vertebrate Paleontology
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Dec 2, 2020 Comite Editor de las JAPV
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LIBRO DE RESÚMENES DE LAS 33as JORNADAS ARGENTINAS DE PALEONTOLOGÍA DE VERTEBRADOS
Topic: JAPV
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Dec 2, 2020 Comite Editor de la JPCN
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Libro de Resúmenes de las 2das Jornadas de Paleovertebrados de la Cuenca Neuquina, realizadas durante el 31 de octubre y el 2 de noviembre de 2019 en la ciudad de Neuquén.
Topic: JPCN
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Nov 20, 2020 Adriana Mónica Blasi, Carola Castiñeira Latorre, Diego Francisco Block, Enriqu Fucks, Laura Del Puerto
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Con la finalidad de contribuir al conocimiento de la evolución paleoambiental y paleoclimática ocurrida desde el Pleistoceno Tardío hasta el Holoceno Tardío en la Pampa Ondulada, noreste de la provincia de Buenos Aires, se presentan los resultados obtenidos en las investigaciones interdisciplinarias efectuadas en la cuenca hídrica Salto-Arrecifes. Estos resultados, se integran con los publicados por los autores de este trabajo referentes a las características geológicas y...
Topics: Pleistoceno–Holoceno, Estratigrafía, Cuencas fluviales, Pampa ondulada, Paleoecología
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Nov 20, 2020 Ariana Paulina Carabajal, Leonardo Filippi, Fabien Knoll
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Narambuenatitan palomoi is a titanosaurian sauropod from the Upper Cretaceous of North Patagonia. Considered initially as a basal titanosaur, this taxon has uncertain phylogenetic relationships within the clade. An X-ray Computed Tomography (CT) scan of the holotype braincase allowed the first reconstruction of the brain and inner ear of this taxon, making it possible to compare the neuroanatomy with that of closely related forms. Except for the slightly sigmodal shape of the endocast in...
Topics: Paleoneurology, Cranial endocast, Inner ear, Dinosauria
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Nov 20, 2020 Damián Andrés Fernández, Adolfina Savoretti
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Se presenta el estudio sistemático de las esporas y formas algales recuperadas de la Formación Río Turbio, Eoceno medio–tardío de la Cuenca Austral. Se describen algas de agua dulce, briofitas, helechos y licofitas. Closterium sp. cf. C. thailandicum Songtham et al., Botryococcus sp., Coelastrum sp. 1, Catinipollis   eiseltalensis Krutzsch, Bryophyta s.l. sp. 1, Kuylisporites waterbolkii Potonié, Matonisporites sp.1, Foveotriletes sp. 1, Polypodiisporites perverrucatus (Couper) Khan y...
Topics: Palinología, Helechos, Sudoeste de Patagonia, Eoceno medio–tardío
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Nov 20, 2020 Timothy Gaudin, Susan Tuckniss, Alberto Boscaini, François Pujos, Gerardo De Iuliis
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Pronothrotherium typicum is a late Miocene–early Pliocene (Huayquerian–Chapadmalalan SALMA) nothrotheriid sloth known from the Catamarca Province of northwestern Argentina. Pronothrotherium is one of four nothrotheriid genera known from relatively complete skeletal material, but unlike the other three, the osteology of Pronothrotherium has not been formally described. The present study provides the first detailed description and illustration of the cranial anatomy of Pronothrotherium ,...
Topics: Xenarthrans, Sloths, Pronothrotherium, Skull, Taxonomy
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Sep 9, 2020 Juan Carlos Fernicola, Sergio Fabián Vizcaíno, M. Susana Bargo, Richard Frederick Kay, Jose Ignacio Cuitiño
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The Santa Cruz Formation (SCF) records high latitude terrestrial paleoecosystems in the Southern Hemisphere during Burdigalian– early Langhian times (Early–Middle Miocene). Mammalian fossils from Río Santa Cruz (RSC) localities were first collected in the late 19th century, forming the basis for the Santacrucian South American Land Mammal Age. New collections permitt an update of the SCF mammalian species along the RSC. The total taxonomic richness is 95 mammalian species. Many species...
Topics: Santacrucian, Burdigalian, Fossil vertebrates, Taxonomic richness, Biozone
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Sep 9, 2020 Michelle Arnal, María Encarnación Pérez, Cecilia Deschamps
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Fossil rodents from the Río Santa Cruz (RSC) classic localities (Santa Cruz Formation, Early–Middle Miocene) are known by the works of F. Ameghino and W.B. Scott since the end of the 19th and beginning of the 20th centuries. These caviomorph rodents have not been comprehensively reviewed since then. In this contribution, we studied new fossil specimens from the cliffs of the RSC (Province of Santa Cruz, Argentina) collected with accurate stratigraphic and geographic data during fieldtrips...
Topics: Santacrucian, Province of Santa Cruz, Hystricognathi, Taxonomy, Systematics, Biostratigraphy,...
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Sep 9, 2020 Gabriela Ines Schmidt, Santiago Hernández Del Pino, Nahuel Antú Muñoz, Mercedes Fernández
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Litopterna from fossiliferous exposures of the Santa Cruz Formation (Early–Middle Miocene) along the Río Santa Cruz, Patagonia Argentina, are analyzed and described. In the prospected localities, known as Barrancas Blancas (Estancia Aguada Grande and Estancia Santa Lucía) and Segundas Barrancas Blancas (Estancia Cordón Alto and Estancia El Tordillo), specimens belonging to the families Proterotheriidae and Macraucheniidae were recorded. Within Proterotheriidae, the species Anisolophus...
Topics: Systematics, Proterotheriidae, Macraucheniidae, Santacrucian, Patagonia
This contribution details new records of Notoungulata and Astrapotheria from the exposures of the Santa Cruz Formation in the Río Santa Cruz (Early–Middle Miocene; Province of Santa Cruz). The astrapothere Astrapotherium sp. Burmeister, the notoungulate toxodonts Homalodotherium sp. Flower, Nesodon sp. Owen and Adinotherium sp. Ameghino, and the typotheres Hegetotherium mirabile Ameghino, Interatherium sp. Ameghino, Protypotherium sp. Ameghino, P. attenuatum Ameghino, P. australe Ameghino...
Topics: Notoungulates, Astrapotheres, Typotheria, Toxodontia, Ameghino, Santacrucian
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The first detailed geological and paleontological survey of the Santa Cruz Formation (Early–Middle Miocene; Burdigalian–early Langhian) along the Río Santa Cruz was carried out in 1887 by Carlos Ameghino, who recovered more than 2000 fossil remains. In that same year, his brother Florentino studied and reported these remains, recognizing 122 taxa, of which 110 were new species. Fourteen of these new species were of sloths (Xenarthra, Folivora). In this contribution we report and describe...
Topics: Burdigalian, Santacrucian, Phyllophaga, Taxonomy, Holotype, Ameghino
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In 1887 Carlos Ameghino carried out the earliest extensive exploration of the fossiliferous localities along the Río Santa Cruz (Patagonia). His brother Florentino erected more than 100 vertebrate species based on the remains that Carlos recovered. The faunal assemblage eventually came to be recognized as the Santacrucian South American Land Mammal Age (Early–Middle Miocene). Over the past several years, an interdisciplinary group from the Museo de La Plata, Museo Argentino de Ciencias...
Topics: Santacrucian, Armadillos, Glyptodonts, Taxonomy., Carlos and Florentino Ameghino
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Sep 9, 2020 Juan Carlos Fernicola, M. Susana Bargo, Sergio Fabián Vizcaíno, Richard Kay
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In 1887, Carlos Ameghino carried out the first geological and paleontological expedition to the Río Santa Cruz (RSC), Patagonia, Argentina. Between 1887 and 1889, Florentino Ameghino studied the fossils obtained by Carlos, founding more than 120 taxa and establishing his Formación Santacruceña and Piso Santacruceño. In 1888, F. Ameghino was exonerated from the Museo de La Plata and replaced by Alcides Mercerat in 1889, starting a strong competition for the Santacrucian fossils, which...
Topics: Santacrucian, Notohippidian, Fossil mammals, Taxonomy, Ameghino
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Jul 28, 2020 Laura Chornogubsky, María A. Abello, and Germán D. Barmak
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Here we summarize the species of Metatheria from the Early–Middle Miocene Santa Cruz Formation at the Río Santa Cruz (RSC; Argentina). We assign newly collected specimens from the RSC localities Barrancas Blancas (BB) and Segundas Barrancas Blancas (SBB) to the known metatherian species. The metatherians from RSC were first described by F. Ameghino in 1887. He did not always establish clearly the type specimens of the species he founded, and often later he chose new type specimens. This led...
Topics: Marsupial, South America, Early Neogene, Santacrucian
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The Santa Cruz Formation constitutes one of the most representative units of the Early-Middle Miocene of South America for its abundant and rich fossil record of vertebrates. The diversity of extinct birds is known so far by at least 17 species grouped in 15 genera and at least 10 families. Most of the avian taxa described from these levels come from localities of the Santa Cruz Province placed next to or along the Atlantic coast. New specimens recovered from the Río Santa Cruz valley, with...
Topics: Aves, Santacrucian, Burdigalian, Early Langhian, Taxonomy
In this contribution, the first anuran fossils from classical Santacrucian localities of the Río Santa Cruz are described. According to proportions and features recognized in the few skull elements recorded, the remains are assigned to the southern gondwanan Calyptocephalella cf. canqueli. This identification extends geographically the distribution of the fossil taxon, defining this species to be a conspicuous component of the aquatic environments of the warm temperate climatic biotas during...
Topics: Calyptocephalellidae, Calyptocephalella canqueli, Neobatrachia, Neogene, Barrancas Blancas Locality
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The Santa Cruz Formation (Early–Middle Miocene) is one of the most widespread sedimentary units of the Argentine Patagonia. This unit contains an abundant and taxonomically diverse fossil vertebrate fauna, especially in mammals. Thus, the paleoecological and paleoenvironmental information derives mainly from the analysis of the vertebrate assemblages, as well as from the ichnological and paleobotanical evidence. The record of freshwater bivalves assigned to the species Diplodon cf....
Topics: Diplodon, Hyriidae, Sehuenense stage, Neogene, Santa Cruz Formation, Argentine Patagonia
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Jul 28, 2020 José I. Cuitiño, Juan C. Fernicola, M. Sol Raigemborn, and Verónica Krapovickas
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The Santa Cruz Formation is an Early–Middle Miocene terrestrial sedimentary succession widely distributed in southern Patagonia. Particularly, it is exposed along the southern margin of the Río Santa Cruz valley where the sedimentological and stratigraphical features are described for three localities. From east to west these localities are: Barrancas Blancas, Segundas Barrancas Blancas and Yaten Huageno. The facies analysis permits us to identify three associations, representing deposition...
Topics: Burdigalian, Sedimentology, Fluvial system, Paleosol, Austral Basin
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Jul 28, 2020 Juan C. Fernicola, M. Susana Bargo, Sergio F. Vizcaíno, Richard F. Kay
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The Thematic Volume “Early-Middle Miocene Paleontology in the Río Santa Cruz, Southern Patagonia, Argentina. 130 years since Ameghino, 1887” deals with the geology, chronology and the fossils of the Santa Cruz Formation in the Río Santa Cruz recovered in recent expeditions (2013-14). It gathers 13 articles by 21 authors and highlights the need to integrate historical information in paleontological studies of the Cenozoic of Patagonia.
Topics: Santacrucian, Notohippidian, Fossil mammals, Taxonomy, Ameghino
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Jul 23, 2020 Ιgnacio Alejandro Cerda, María Eugenia Pereyra, Mariana Garrone, Denis Ponce, Tamara Gisel Navarro, Romina González, Mariano Militello, Carlos Alberto Luna, Juan Marcos Jannello
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The study of bone microstructure of fossil vertebrates (i.e. paleohistology) has demonstrated to be a very important source of paleobiological information. Paleohistological studies are based on the standardized analysis of petrographic thin sections. Although the development of new technologies (e.g. microtomography) have provided non-destructive procedures for the study the fossil tissues, thin sections are still the main information source in paleohistology. In this contribution, we provide...
Topic: Paleohistology
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Jul 23, 2020 Alejandro Otero, Agustín Pérez Moreno, Peter Falkingham, Guillermo Cassini, Agustín Ruella, Mariano Militello, Néstor Toledo
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Three-dimensional (3D) surface scanning includes techniques of image acquisition and image processing. Among the former, hardware devices (e.g., portable and non- portable scanners, camera) capture images from the target, whereas image processing is conducted via specialized software, in which acquired images are processed to merge them into a single 3D model. Image surface scanning include a wide variety of devices which incorporate different image acquisition techniques, all of them with...
Topics: Fossils, Laser, Photos, Software, Post-processing
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Jul 23, 2020
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Addendum of Abstracts of the 33° JAPV
Topic: Jornadas Argentinas de Paleontologia de Vertebrados
Abstract book of the Reunión de Comunicaciones de la Asociación Paleontológica Argentina, held in the city of La Plata during the  27-29 of November 2019
Topics: Abstracts, La Plata, Argentina, Paleontology
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Nomenclatural Note
Topics: Paleontology, Nomenclature, Notoungulata
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Jun 16, 2020 Richard Frederick Kay, Jonathan Marcus G. Perry
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Four specimens of primates were collected from the Santa Cruz Formation (Early–Middle Miocene) during expeditions undertaken by the Museo de la Plata, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, and Duke University in 2013, 2014, and 2017. A new species of Homunculus Ameghino, H. vizcainoi (Platyrrhini, Homunculidae), was identified at Barrancas Blancas, and Segundas Barrancas Blancas localities on the right bank of the Río Santa Cruz (Santa Cruz Province, Argentina)....
Topics: Homunculus, Carlocebus, Santa Cruz Formation, Pinturas Formation, Platyrrhini, Anthropoidea,...